* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes flash {
  0% {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

@imgW: 1059px;
@imgH: 750px;
body {
  background: black;
  transition: background-color 1s;
  //overflow: hidden;
  @mainW: 1457px;
  @mainH: 792px;
  position: relative;

  .flashBtn {
    width: 100px;
    height: 100px;
    position: absolute;
    background: yellow;
    opacity: 0.8;
    border-radius: 50%;
    z-index: 2000;
    left: 0;
    top: 0;
    transition: all 0.5s;

    filter: blur(20px);
    animation-duration: 1s;
    animation-name: flash;
    animation-iteration-count: infinite;

  }

  main {

    width: @mainW;
    //width: 100%;
    margin: 0 auto;
    height: @mainH;
    outline: solid 1px white;
    position: relative;
    overflow: hidden;
    transform-origin: top center;
    transform: scale(1);

    .mask {
      position: absolute;
      width: 180px;
      height: 180px;
      border-radius: 50%;
      z-index: 1000;
      border: 3px solid white;
      box-shadow: 0 0 0 1000px rgba(0, 0, 0, 1);
      filter: blur(50px);
      transition: all 0.8s;

    }


    .bg {
      transition: all 1s;
      animation-name: fadeIn;
      animation-duration: 1s;
      outline: solid 2px;
    }

    .bg10 {
      left: @mainW*0.5;
      top: @mainH*0.5;
      margin-left: -@imgW*0.5;
      margin-top: -@imgH*0.5;
    }

    .maskBg {
      width: 100%;
      position: absolute;
      left: 0;
      top: 0;
      filter: blur(30px);
    }

    .light {
      transition: all 0.5s;
      animation-name: fadeIn;
      animation-duration: 1s;
      transform: scale(0.4);
    }

    img {
      position: absolute;
    }

  }
}
